• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.416-417
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• 2015

In this study, the parameters of the lightning flashover rate calculation algorithm in South Korea, USA, Japan are investigated for the suitable algorithm for South Korea. Each parameters used in each calculation algorithms have a obvious difference by the environment of the area and transmission lines, because they have different environmental parameters respectively. In this paper, the environmental parameters are weighted according to the change of outputs by different inputs, environmental parameters. In addition, the methods of the selection CRIEPI algorithm and the application EPRI, CRIEPI parameters for improvement the KEPRI algorithm are proposed.

• 전기의세계
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• v.27 no.5
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• pp.5-12
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• 1978

1.Power utilities and CRIEPI are very active in almost all aspects of power systems research. 2.About 50% of research activity of CRIEPI is made under the joint work with power utilities. 3.Research motivation of manufactures are mainly stimulated by the need of power utilities and manufacturers are closely collaborating with power utilities. 4.Main effort of universities is concentrated upon the theoretical aspects of network analysis and the means of stability improvement. Univer sities are doing research rather independently of industry unless inexceptional cases. 5.Universities are making a significant contribution to the exploration of new horizon of power systems engineering, namely, in the research on the social impact on the future of power system. 6.Current main interest of power systems reserch is centered around the stability problem and power system operation and control. Research activity in power system planning is rather low as compared to that in these two major fields. A similar statement holds for the analysis of electromagnetic transients and short circuit analysis. However a new research field is sprouting in the area of power system protection.

• Proceedings of the Korean Quaternary Association Conference
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• 2004.11a
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• pp.68-72
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• 2004

• Proceedings of the KIEE Conference
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• 2001.07c
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• pp.1337-1339
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• 2001

We have investigated the relation between the molecular weight distribution (MWD) of diffusible species and the recovery rate of hydrophobicity of room-temperature vulcanizing (RTV) silicone rubber (SIR) using solvent extraction at various temperatures. It was observed that the extract had a MWD ranging from a few hundreds g/mol to hundreds of thousands g/mol. By measuring the migration of siloxane to the extracted SIR surface through a thin carbon coating, the aspect of migration of diffusible species was observed as a real time plot, and the time constant of the migration was also calculated. According to the time dependence of IR-absorbance, the time constant was increased with the increase of MW of the extracts.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1635-1637
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• 2003

송전선의 뇌사고율은 뇌방전 현상, 송전선의 써지 전달 현상, 아킹혼 사이의 섬락 현상 등 다양한 현상이 관련된다. 송전선의 내뢰설계 목표는 이러한 자연현상 및 물리적인 현상이 편차를 포함하고 있다는 것을 인식하고, 가능한 한 정확도가 높은 뇌사고율을 예측을 수행하고 허용 가능한 뇌사고율을 산정하여 송전선로 설계시 반영하는 것이다. 이러한 예측 계산을 위해 한전에서는 EPRI에서 개발한 FLASH 프로그램을 기본으로 사용해 왔으며, 이 예측계산법의 타당성은 예측 사고율과 사고 실적과의 비교에 의해 검토되어야 한다. 한전에서는 과거 10년간의 뇌사고 실적과 FLASH 프로그램으로 계산한 예측 사고율이 차이가 많이 나타나고 있어, FLASH 프로그램의 예측 계산법의 타당성에 의문을 제기하고 있는 상황이다. 일본 전력회사들은 뇌사고율을 예측 계산하기 위하여 1988년에 전력중앙연구소에서 개발한 프로그램을 사용하여 왔으며, 최근에 사고 실적과의 비교 및 관련 연구를 수행하여 예측 계산 프로그램에 사용되는 파라메타를 수정 보완한 LORP2000-1을 완성하였다. 본 논문에서는 지리, 기후적으로 한국과 유사한 일본의 자연현상을 반영한 LORP 프로그램의 예측계산법이 한전 송전선로의 뇌사고율 예측 계산에 적용 가능성을 사고 실적과의 비교를 통해 검토하였다.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2411-2413
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• 1999

Regarding the application of diagnistic technology using PD signal to power apparatus, it is necessary to discriminate the type of defect as well as to determine whether the PD occurs or not. In this research, PD characteristics of multi-defects insulating system were presented, the PD signals were detected from three kinds of electrode systems, IEC(b), needle-plane and CIGRE method II. To make multi-defect systems artificially, we combined three electrode systems and applied same test voltage simultaneously.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2003.08a
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• pp.18-27
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• 2003

The goal of the UN Framework Convention on Climate Change (UNFCCC) is to stabilize atmospheric CO2 concentration for preventing global warming in future. However, there are many unknown factors regarding stabilization of CO2 concentration. What level of concentration should be appropriate to prevent global warming？ When should we stop the increase of CO2 concentration\ulcorner What kind of countermeasures of reducing CO2 emission will be available for CO2 stabilization？(omitted)

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2004.11a
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• pp.76-77
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• 2004

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2004.11a
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• pp.78-80
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• 2004

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2001.02a
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• pp.131-131
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• 2001

FY2000, Japanese government has started three new projects on superconductive power application. Two are succeeding projects of flywheel energy storage and superconducting generator. The other one is fully new project on ac application of superconductivity. Therefore, there are four national projects in Japan on power application of superconductivity, including SMES project Though each project will be reviewed in detail in my talk, outlines are as follows; SMES : FY1999-FY2003, carried by ISTEC Superconducting generator: FY2000-FY2003, carried by Super-GM AC application: FY2000-FY2004, carried by Super-GM Flywheel energy storage: FY2000-FY2004 carried by ISTEC.